Tube take-up for two-for-one twister



April 5, 1955 E. K. BAUER ETAL 2,705,598

TUBE TAKE-UP FOR TWO-FOR-ONE TWISTER Filed Aug. 17. 1955 2 Sheets-Sheet l April 5, 1955 E. K. BAUER ET AL 2,705,598

TUBE TAKE-UP FOR TWO-FOR-ONE TWISTER Filed Aug. 17, 1953 2 Sheets-Sheet 2 United States Patent TUBE TAKE-UP FOR TWO-FOR-ONE TWISTER Ernest K. Bauer, Meadville, and Julius Frank Sprute,

Cochranton, Pa., assignors to American Viscose Corporation, Wilmington, Del., a corporation of Delaware Application August 17, 1953, Serial No. 374,687

4 Claims. (Cl. 242-43) This invention relates to yarn-winding apparatus and, more particularly, to an improved adjustable traverse for building various shaped yarn packages.

It has been customary to manufacture spinning frames used in the textile arts with mechanism which simultaneously spins or twists upwards of 50 yarn ends. A single traverse mechanism controls the manner in which the yarn is spun onto the packages so that ordinarily the operator cannot make individual adjustments or repairs to one end without stopping the entire machine. Furthermore, the ability to control the shape of the yarn packages on such a machine or to wind different shaped packages simultaneously on the same machine has not been possible.

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driving roll 16 for turning the yarn package spindle 17. A cardboard core or cone 18 is secured to spindle 17 in the usual manner and the driving force for turning the cone is supplied through driveshaft 19. Spindle 17 is rotatably supported in a cradle 20 which includes a shaft 21 journaled in flanges 22 and 23 and retained therein by a collar 24. Flanges 22 and 23 are secured to vertical frame member 25 and may be provided with one or more The primary object of the present invention, therefore, 5 is to provide a yarn-traverse mechanism capable of 1nd1- vidually controlling the package build-up of the various yarn ends on a multiple spinning or twisting frame.

A further object of the invention is to provide in yarntraverse mechanism a specially shaped adjustable cam, rotatable during yarn package build-up to control the shape of the package.

A still further object of the invention is to provide in a yarn-twisting machine a rock shaft having a cradle on which the yarn package builds up, a cam connected to the cradle, and a cam follower actuated by the cam to change yarn guide mechanism on the traverse bar.

Further objects will be apparent from the specification and drawings in which Figure 1 is a top view of a single yarn-winding station on a multiple-end yarn twister constructed in accordance with the present invention;

Figure 2 is a view of part 'of the structure of Figure 1 with the yarn package fully wound;

Figure 3 is a section as seen at III-III of Figure 1;

Figure 4 is an enlarged detail of the cam as shown in Figure 3;

Figure 5 is an enlarged sectional detail as seen at V--V of Figure 1;

Figure 6 is an enlarged sectional detail as seen at VI-VI of Figure l and Figures 7-10 are diagrammatic outlines of yarn packages which may be wound with the aid of the present invention.

The invention comprises essentially the provision of a thread guide in the form of a bell crank having its pivot mounted on the conventional traverse bar. One arm of the bell crank is controlled by a slide which is in turn pivotally mounted on the stationary frame structure of the spinning machine. Pivoting of the slide changes the angular position of the bell crank guide during its stroke across the slide so that the stroke of the thread-guiding arm of the bell crank may be varied from a maximum position to a minimum position. The package spindle is carried in a cradle which pivots upwardly and controls the pivoted position of the slide in accordance with the amount of yarn wound on the package. A control link for this purpose comprises a cam secured to the cradle, a rocker arm actuated by the cam, and a connecting link between the rocker arm and the slide. The amplitude of the displacement of the slide at any given point in the package buildup may be controlled by the shape of the cam which in turn correspondingly controls the shape of the package.

Referring now more particularly to the drawings, a yarn-spinning frame, which may be of the two-for-one twister type, is shown fragmentarily in Figures l-3. Horizontal frame member 15 supports the conventional webs 26, 26.

Shaft 21 carries a flanged hub 30 to which a specially shaped cam 31 is selectively positioned by means of bolts 32, 32. As the package of yarn 33 builds up, as shown in Figure 2, cradle 20 pivots correspondingly through the are 34 (Figure 3) from the full line position to the broken line position. This in turn rotates shaft 21 and cam 31 to actuate a spring-loaded rocker arm 35 in accordance with the shape of the cam.

The point at which yarn is wound on the spindle or cone is controlled by a conventional thread guide 36 forming one end of a pivoted bell crank lever 37. This bell crank is carried in the traverse bar 38 and journaled therein by a flanged bushing 39. The centerpost 37a of the bell crank extends through the traverse bar 38 and is retained to the upper arm 3712 by means of a nut 40. It will thus be apparent that the entire bell crank oscillates back and forth in accordance with the movement of traverse bar 38. The angular position of the thread guide 36, however, with respect to the traverse bar 38 and spindle 17 is varied by pivoting the bell crank on its own fulcrum. This is accomplished by means of a rotatable slide block 45 pivotally mounted on frame structure 46 by means of stud 47. The stud nut 48 draws up against a flanged sleeve 49 so that it may be tightened against the slide 45 and still serve as a bearing surface in the bushing 50. The end of block 45 is rigidly connected to one end of rocker arm 35 by means of an adjustable link 51 having ball and socket connections 52, 52 at each end. The rocker arm 35 is spring loaded to urge the cam follower 35a against the cam by means of an extension spring 53 anchored to frame member 25 at 54. The slide 45 is grooved or slotted on its upper surface to provide a channel or guide for the lower arm 370 of the bell crank by means of a pin or roller 37d. Clips 55 and 56 are secured to frame 46 by screws 57, 57 and serve as retainers for each end of the slide 45 by means: of slots 58, 58 therein.

In the embodiment shown in Figure 4, cam 31 is provided with four operating cam surfaces 60, 61, 62 and 63 of substantially equal angularity. Cam 31, as shown in Figure 3, is adjusted to wind a package 33 of the shape shown generally in Figure 2. For this purpose we use a straight cam surface 60 so that as the package increases in diameter cradle 20 pivots in equal increments to displace the rocker arm 35 which in turn gradually moves the slide in a counter-clockwise direction from the position shown in Figure l to the position shown in Figure 2. This action in turn changes the length of the stroke of yarn guide 36 and ultimately reduces the stroke to a minimum as shown in Figure 2. Such a package has substantially conical ends with the maximum slope or angularity. Other package shapes which can be obtained are shown in Figures 8l0, such as the cam surface 61 which likewise provides for substantially constant decrease in stroke but with a final or minimum stroke much less than that obtained with cam face 60. By removing screws 32, 32 and turning cam 31 approximately any of the surfaces 60-63 may be utilized to actuate the cam follower 35a on the rocker arm 35.

Figure 7 shows schematically the outline of a yarn package such as would be obtained by the cam surface 61 in which the decrement of yarn guide travel is very small. This gives a package with comparatively steep sides. If the cam 31 is positioned to present cam surface 62 to cam follower 35a, the shape of the package will appear generally as shown in Figure 8 in which the decrement of stroke is likewise very gradual at first but changes rapidly near the end of the winding to provide a curved or contoured edge as the yarn guide stroke quickly shortens. When cam 31 is adjusted to present the cam face 63 to cam follower 35a, a package such as shown schematically in Figure 9 can be wound. In this case the stroke of yarn guide 36 rapidly decreases to a minimum and then just as rapidly increases again to a maximum. Further variations in the shape of the cam may be achieved so that a yarn package such as shown in Figure 10 could be wound. In this case the stroke rapidly decreases for about half the radius of the package whereupon the stroke is instantly reset to a maximum to perform a simple repeat winding.

It will thus be understood that we have provided a traverse mechanism for yarn packages which is effective, simple, easy to manufacture and which enables a wide range of independent results to be achieved on the same machine. The use of a cam to detect pivoting of the carriage as the package builds up permits different shaped packages to be wound. With the use of substituted cams or cam-type linkages, the pivoting can be amplified as may be desired.

Having thus described our invention, we claim:

l. Traverse control mechanism for yarn-winding machines comprising a yarn package spindle, a cradle on 20 which said spindle is rotatably mounted, a frame in which the cradle is pivotally mounted, a cam detachably secured to the cradle concentric with the mounting axis of the cradle in the frame, a cam follower pivotally mounted on the frame and operatively associated with said cam, a variable traverse mechanism positioned on the frame to guide yarn wound onto the spindle, and connecting means between said variable traverse mechanism and the cam follower to vary the amplitude of the yarn traverse guide in accordance with the increment of pivotal movement of the cradle in the frame.

2. Apparatus in accordance with claim 1 in which the cam has at least one straight-line surface for building conical-end yarn packages.

3. Apparatus in accordance with claim 1 in which the cam has a curved surface providing initial gradual decrease in the yarn guide stroke and final rapid decrease in yarn guide stroke.

4, Apparatus in accordance with claim 1 in which the cam has a cam surface in which the cam follower makes at least one return to a preceding position to provide a repeat in the amplitude of the yarn guide traverse.

References Cited in the file of this patent UNITED STATES PATENTS 2,489,134 Hill Nov. 22, 1949 FOREIGN PATENTS 16,305 Great Britain Nov. 10, 1888 325,117 Italy Feb. 28, 1935 655,504 Germany Jan. 17, 1938 

